To create your own VLF-ONE snap-in list refer to Making your own VLF-ONE Instance List Browser.
The VLF-WIN example code is:
* =======================================================
* Component : XXXXXXXXXX
* Type : Reusable Part
* Description : Sample of a snap-in instance list browser
* displaying an instance list as a tree control.
* Disclaimer : The following material is supplied as
* sample material only. No warranty concerning this
* material or its use in any way whatsoever is
* expressed or implied
* =======================================================
BEGIN_COM ROLE(*EXTENDS #VF_AC012) HEIGHT(181) LAYOUTMANAGER(#ATTACHMENT_MANAGER) WIDTH(482)
* Overall attachment layout manager
DEFINE_COM CLASS(#PRIM_ATLM) NAME(#ATTACHMENT_MANAGER)
* The unleveled tree
DEFINE_COM CLASS(#PRIM_TRVW) NAME(#VIS_Tree) COLUMNBUTTONHEIGHT(18) DISPLAYPOSITION(1) DRAGCOLUMNS(True) FULLROWSELECT(True) HEIGHT(181) LEFT(0) MULTIPLESELECTSTYLE(SameLevel) PARENT(#COM_OWNER) SELECTIONSTYLE(Multiple) TABPOSITION(1) TABSTOP(False) TOP(0) VIEWSTYLE(UnLevelled) VISUALSTYLE(#VF_VS101) WIDTH(482)
* Attachment item for layout management
DEFINE_COM CLASS(#PRIM_ATLI) NAME(#TREE_ATTACHMENT_ITEM) ATTACHMENT(Center) MANAGE(#VIS_Tree) PARENT(#ATTACHMENT_MANAGER)
* Standard 2 fields for all levels in the tree
DEFINE_COM CLASS(#PRIM_TVCL) NAME(#Tree_VID1) CAPTION('Code/Name') CAPTIONTYPE(Caption) DISPLAYPOSITION(1) LEVEL(1) PARENT(#VIS_Tree) SORTONCLICK(True) SOURCE(#VF_ELXVI1) WIDTH(17)
DEFINE_COM CLASS(#PRIM_TVCL) NAME(#Tree_VID2) CAPTION('Description') CAPTIONTYPE(Caption) DISPLAYPOSITION(2) LEVEL(1) PARENT(#VIS_Tree) SORTONCLICK(True) SOURCE(#VF_ELXVI2) WIDTH(16)
* 2 sample additional alpha columns
DEFINE_COM CLASS(#PRIM_TVCL) NAME(#Tree_acolumn1) CAPTION('Phone') CAPTIONTYPE(Caption) DISPLAYPOSITION(3) LEVEL(1) PARENT(#VIS_Tree) SORTONCLICK(True) SOURCE(#VF_ELXCA1) WIDTH(13)
DEFINE_COM CLASS(#PRIM_TVCL) NAME(#Tree_acolumn2) CAPTION('Address') CAPTIONTYPE(Caption) DISPLAYPOSITION(4) LEVEL(1) PARENT(#VIS_Tree) SORTONCLICK(True) SOURCE(#VF_ELXCA2) WIDTH(14)
* 1 sample additional numeric column
DEFINE_COM CLASS(#PRIM_TVCL) NAME(#Tree_Visncolumn1) CAPTION('Zip Code') CAPTIONTYPE(Caption) COLUMNALIGN(Right) DISPLAYPOSITION(5) LEVEL(1) PARENT(#VIS_Tree) SORTONCLICK(True) SOURCE(#POSTCODE)
* Hidden columns to track AKey1() AKey2() AKey3() and BusinessObjectType() for every tree item
DEFINE_COM CLASS(#PRIM_TVCL) NAME(#TREE_IAK1) LEVEL(1) PARENT(#VIS_Tree) SOURCE(#VF_ELXAK1) VISIBLE(False)
DEFINE_COM CLASS(#PRIM_TVCL) NAME(#TREE_IAK2) LEVEL(1) PARENT(#VIS_Tree) SOURCE(#VF_ELXAK2) VISIBLE(False)
DEFINE_COM CLASS(#PRIM_TVCL) NAME(#TREE_IAK3) LEVEL(1) PARENT(#VIS_Tree) SOURCE(#VF_ELXAK3) VISIBLE(False)
DEFINE_COM CLASS(#PRIM_TVCL) NAME(#TVCL_BOT) LEVEL(2) PARENT(#VIS_Tree) SOURCE(#VF_ELBOT) VISIBLE(False)
* Currently focused tree item
Define_com #Prim_Objt #FocusTreeItem Reference(*dynamic)
* UI Control Definitions
Define Field(#UI_ISDEAF) Reffld(#VF_ELBOOL)
Def_Cond Name(*UI_LISTEN) Cond('#UI_IsDeaf *ne TRUE')
* Tree node tracking - track department nodes and department section nodes
DEFINE_COM CLASS(#Prim_kcol<#Prim_tvit #deptment>) NAME(#DepNodes) STYLE(Collection)
DEFINE_COM CLASS(#Prim_kcol<#Prim_tvit #std_texts>) NAME(#DepSecNodes) STYLE(Collection)
* ============================================================================
* Method Definitions
* ============================================================================
* ----------------------------------------------------------------------------
* Redefine the standard uClearInstanceList method
* ----------------------------------------------------------------------------
MthRoutine uClearInstanceList Options(*Redefine)
Invoke #DepNodes.RemoveAll
Invoke #DepSecNodes.RemoveAll
Clr_List #Vis_Tree
Set_ref #FocusTreeItem *null
EndRoutine
* -----------------------------------------------------------------------------
* Redefine the standard uAddListEntry method
* -----------------------------------------------------------------------------
Mthroutine Name(uAddListEntry) Options(*Redefine)
Define_com #Prim_tvit #DepParent Reference(*Dynamic)
Define_com #Prim_tvit #SecParent Reference(*Dynamic)
* The filter(s) supply SECTIONS and EMPLOYEES business objects in the instance
* list, but this instance list browser has decided to create a 3 level tree to
* visualize the data slightly differently. Handle each business object type differently ....
CASE OF_FIELD(#BusinessObjectType.Value)
* ========================
* SECTIONS business object
* ========================
WHEN VALUE_IS(= SECTIONS)
* Check for a parent department node in the tree and add one if required
Set_ref #DepParent #DepNodes<#AKey1.Value>
If_ref #DepParent is(*null)
#VF_ELXAK1 := #AKey1.Value
#VF_ELXAK2 := ''
#VF_ELXAK3 := ''
#VF_ELBOT := ''
#VF_ELXVI1 := #AKey1.Value
#VF_ELXVI2 := 'Department ' + #AKey1.Value
#VF_ELXCA1 := ''
#VF_ELXCA2 := ''
#POSTCODE := 0
Add_Entry #Vis_Tree
Set_Ref #DepParent #Vis_Tree.CurrentItem
Set_Ref #DepNodes<#AKey1.Value> #DepParent
Endif
* Now add in the section node as a child of the department and keep a track of it
#VF_ELXAK1 := #AKey1.Value
#VF_ELXAK2 := #AKey2.Value
#VF_ELXAK3 := #AKey3.Value
#VF_ELBOT := #BusinessObjectType.Value
#VF_ELXVI1 := 'Section ' + #AKey2.Value
#VF_ELXVI2 := #AColumn1.Value
#VF_ELXCA1 := ''
#VF_ELXCA2 := ''
#POSTCODE := #Ncolumn1.Value
Add_Entry #Vis_Tree
Set #Vis_Tree.CurrentItem ParentItem(#DepParent)
Set_Ref #DepSecNodes<(#AKey1.Value + '.' + #Akey2.Value)> #Vis_Tree.CurrentItem
* =========================
* EMPLOYEES business object
* =========================
WHEN VALUE_IS(= EMPLOYEES)
#VF_ELXAK1 := #AKey1.Value
#VF_ELXAK2 := #AKey2.Value
#VF_ELXAK3 := #AKey3.Value
#VF_ELBOT := #BusinessObjectType.Value
#VF_ELXVI1 := #VisualId1.Value
#VF_ELXVI2 := #VisualId2.Value
#VF_ELXCA1 := #AColumn1.Value
#VF_ELXCA2 := #AColumn2.Value
#POSTCODE := #NColumn1.Value
Add_Entry #Vis_Tree
* Final the section node (previously added) that will be this nodes tree parent
Set_Ref #SecParent #DepSecNodes<(#AKey1.Value + '.' + #Akey2.Value)>
* Show an error or set the parent item correctly ....
If_ref #SecParent is(*null)
Use message_box_show ( ok ok error *Component 'Attempt to add employee with out a valid SECTIONS parent')
else
Set #Vis_Tree.CurrentItem ParentItem(#SecParent)
Endif
ENDCASE
* Finished
EndRoutine
* -------------------------------------------------------------------
* Determine whether to accept selection of new Sections from the grid
* -------------------------------------------------------------------
EVTROUTINE HANDLING(#Vis_Tree.ItemGotFocusAccept #Vis_Tree.ItemGotSelectionAccept) Accept(#ACCEPT) OPTIONS(*NOCLEARMESSAGES *NOCLEARERRORS)
If (#vf_elbot *ne ' ')
If Cond('#avFrameworkManager.uCurrentLockStatus *EQ TRUE')
#ACCEPT := FALSE
#UI_ISDEAF := TRUE
Else
#ACCEPT := TRUE
#UI_ISDEAF := FALSE
Endif
Endif
ENDROUTINE
* -----------------------------------------
* Handle selection of an item from the tree
* -----------------------------------------
EvtRoutine Handling(#Vis_Tree.ItemGotSelection) OPTIONS(*NOCLEARMESSAGES *NOCLEARERRORS)
If (#vf_elbot *ne ' ')
Signal SetSelectedInstance AKey1(#VF_ELXAK1) AKey2(#VF_ELXAK2) AKey3(#VF_ELXAK1) BusinessObjectType(#VF_ELBOT)
* Handle the special case where the focus did not fire correctly
If_ref #FocusTreeItem is(*null)
Set_ref #FocusTreeItem #Vis_Tree.CurrentItem
Signal SetCurrentInstance AKey1(#VF_ELXAK1) AKey2(#VF_ELXAK2) AKey3(#VF_ELXAK3) BusinessObjectType(#VF_ELBOT)
Endif
Endif
EndRoutine
* -------------------------------------------
* Handle unselection of an item from the tree
* -------------------------------------------
EvtRoutine Handling(#Vis_Tree.ItemLostSelection) OPTIONS(*NOCLEARMESSAGES *NOCLEARERRORS)
If (#vf_elbot *ne ' ')
Signal DropSelectedInstance AKey1(#VF_ELXAK1) AKey2(#VF_ELXAK2) AKey3(#VF_ELXAK3) BusinessObjectType(#VF_ELBOT)
Endif
EndRoutine
* -------------------------------------
* Handle focus of an item from the tree
* -------------------------------------
EvtRoutine Handling(#Vis_Tree.ItemGotFocus) OPTIONS(*NOCLEARMESSAGES *NOCLEARERRORS)
If Cond(*UI_LISTEN)
If (#vf_elbot *ne ' ')
Signal SetCurrentInstance AKey1(#VF_ELXAK1) AKey2(#VF_ELXAK2) AKey3(#VF_ELXAK3) BusinessObjectType(#VF_ELBOT)
Endif
Endif
EndRoutine
* ---------------------------------------------
* Handle loss of focus of an item from the tree
* ---------------------------------------------
EvtRoutine Handling(#Vis_Tree.ItemLostFocus) OPTIONS(*NOCLEARMESSAGES *NOCLEARERRORS)
If (#vf_elbot *ne ' ')
Signal DropCurrentInstance AKey1(#VF_ELXAK1) AKey2(#VF_ELXAK2) AKey3(#VF_ELXAK3) BusinessObjectType(#VF_ELBOT)
Endif
EndRoutine
End_Com